The GC delivery quest required always only a craft for any DoH classes,
it means that if a recipe yeld 1 item, they will require you 1 item,
if a recipe yeld 3 items, like potions usually do, they will require you 3 of them.

Now only for Alchemist they require 3 Grade 1 Strength Dissolvent, they is crafted 1 by one.
Is it an error due to the nature of the item?
(It was confused for a potion?)